Paper-machine couch roll



Sept 23 1924.

S. G. CHAMBERS PAPER MACHINE CoUcH ROLL Filed Avril ll. 1923.

Patented sept. z3, 1924.

sTEPHEN Gnovnn criaturas, or OREGON Grrr, OREGON.

PAPER-MACHINE COUCH ROLL.

Application nled April 11, 1923. Serial No. 631,474.

To all whom t may concern.'

Be it known that I, STEPHEN GROVER CHAMBnRs, a citizen of the United States, and a resident of Oregon City, county .of Clackamas, and State of Oregon, have 1nvented a new and useful Improvement in Pa r-Machine Couch Rolls, of which the .fol owing is a specification.

Miy invention relates to paper making ma-v of paper. My invention concerns these two4 couch rolls which, as now made, consist of two metallic rollers which are placed one above the other and the upper one is covered by a woven jacket. The ends ofthe 'acket are secured around the ends -of the ro l. It'

has been found that this jacket will tend to creep rotatively on the metallic roll.. It was also noticed that the middle portion of the jacket would creep faster than the adjacent portions because the jacket being bent over the end of the roll exerted a eater frictional resistance to relative motion than did the straight surfaces.Y

The object of my invention, therefore, is to provide a means whereby the woven jacket of the top couch roll of paper machine will creep uniformly in relation to the roll itself.

I attain this object by providing two dished plates, one on each end of the roll, and mounted for independent rotation with the roll, the peripheries of these disks forming substantially a continuation of the surface of the roll, but the disk being spaced slightly therefrom and having no appreciable frictional bearing on the ends of the'roll and being ada ted to have the ends of the covering recesse thereto.

I have shown this, device in the accompanying drawings, in which:

Fig. 1 is a fra entary view of the roll having a dished p ate on the end adapted to have the ends therewith;

of the covering engaged,

Fig. 2 is an end View of the roll shown 1n F1g. 1 and shows how the jacket is secured around the dished plate; and

Flg. 8 Iis a perspective,A view of this dished plate which is independently mounted at the end of the roll.

The roll a is made with a stub shaft b on which the roll is journaled. A .ball race c 1s provided on each end of the roll w and the dlsh-shaped plate e is rotatably mounted on the stub shaft b so as to bear against the race c. The woven jacket f is slightly longer than the roll a and the ends are crimped around the dish shaped plates e. The folds g are sewn as at k so as to hold the jacket t-aut around the roll a. The jacket f is thus entirely independent of the roll a except that it bears against the periphery along its entire length. The rim i of the dished plate e forms substantially a continuation of the periphery of the roll a but is slightly spaced therefrom so as not to have frictional engagement therewith. It can thus be seen that the woven jacket f will have a uniform frictional contact with the roll a along its entire length and in practice it has been found that thefrictional engagement of the dished plate e on the race c is ne ligible so that the ends of the jacket. will grip theroll substantially in the same degree as the middle portion. It is also to be noticed that thejacket being fastened over the plates and not being snubbed around the end of the roll will cause the jacket to be of uniform thickness thruout its entire length when in operation. This is of considerable importance because the leastvariation in thickness of this jacket will result in a corres ending variation in thickness of the sheet oiJ paper stock which contacts with the jacket at this point and will thus cause the wet sheet to break at the thinner portions.

I claim:

1. In a couch roll having a resilient covering, the combination: of a.y roll provided with stub axles 'at its ends, a plate mounted for independent rotation about each, of said axles, said plates being diametri'cally the same as, and constituting a continuation of the peripheral surface of, said couch roll, means for spacing the plates relatively from the roll ends so as to have no-appreciable frictional bearing on such ends, the ends of the covering for-said couch-roll extendint beyond the ends of the roll and engaged wi said plate, whereby an creeping of the covering placed on the ro is rendered substantially uniform ,thruout 1ts length.. 2. In a couch roll having a resilient covering, the combination of a. roll provlded wlth stub axles of smaller diameter at 1ts ends, a

l 'plate mounted on each of said axles and plate facing the roll, means for positioning the plates relatively to the roll ends so as to have no appreciable frictlonal bearing on such ends, the ends of the covering for said couch roll extending beyond the ends of the roll and engaged with said plate, whereby an creeping of the covering placed on the roll is rendered substantially uniform thruout its length.

4. In a couch roll having a resilient covering, the combination of a roll provided with 3 stub axles at its ends, a dished plate mounted for independent rotation about each of said axles, the concaved rtion of said dished plate facin the ro said plates being diametrically ing a continuation of the peripheral surface of, said couch roll, means or iositionin the plates relatively to the roll en s so as to ave no appreciable frictional bearing on such ends, t e ends of the covering for said couchroll extending beyond the ends of the roll and engaged with said plate, whereby any cree ing of the covering placed on the roll is ren ered substantially uniform thruout its length.

5. In a couch roll having a resilient covering, the combination of a roll rovided with stub axles at its ends, a dish plate mounted for independent rotation about each of said axles, the concaved portion of said dished plate facing the roll, said plates being diametrically the same as, and constituting a continuation of the peripheral surface of, said couch roll, the ends of the coverin for said couch-roll extendin beyond the en s of the roll and engaged wit said plate, whereby any creepin of the coverin placed on the roll is rendered substantia y uniform thruout its entire length.

STEPHEN GROVER CHAMBERS.

e same as, and constitut- 

